2a thread class right-hand 0.125" thread length flat countersunk undercut head style 40 thread quantity per inch passivate surface treated unc thread series
2a thread class right-hand 0.250" thread length fillister head style 32 thread quantity per inch navy special project passivate surface treated unc thread series
Used on 1005-01-347-4857,barrett .50 caliber semi-automatic rifle,model 82a1a. 2a thread class right-hand 0.230" thread length 24 thread quantity per inch unf thread series
2a thread class right-hand 0.750" thread length hexagon head style 18 thread quantity per inch navy special project hex element thru slot waf 0.188 x 0.150 deep passivate surface treated unc thread series